The inflow of salt water which poured from the north into the Great Belt 

 at the end of June 1904 came too late to take the cod youug witli it. The pelagic 

 young of the cod were still in the Skager Rak on the Ist of June; but when the 

 inflow corae, the cod young in our uorthern waters had already passed over to the 

 bottom-stage. * On the other hånd the \v biting young were still in the pelagic 

 stage and were therefore carried by the current southwards from the Skager Rak 

 and the northern Kattegat right down through the Great Belt. 



The occurrence of the whiting j'oung still further to the south and east 

 later iu the autumn, in September both in the Sound and true Baltic, was due 

 partly to the great "inflow" at the end of June partly perhaps to a continued 

 flow** in the same direction, as the young a short time after had passed over 

 into the bottom-stage. 



In order, to obtain a view over tiie growth of the whiting young, I hava 

 brought together all the measurements of whiting (O — 20 ctm.) made in 1904 on to a 

 Table in the same way as for the cod young (see Tab. E.). All the measurements 

 taken in the course of a month in each single region are collected into a list, and 

 these lists are placed on the Table so that the size of the young whiting eau be 

 foUowed from month to month. The whiting taken in intermediate hauls are kept 

 separate from those taken in bottom-hauls. In this way we can see the size of 

 the young living in the intermediate water-layers; on the other hånd we canuot 

 couclude that the whiting taken in the bottom-hauls were therefore living on the 

 bottom. 



Great difficulties are expe'rienced in following the growth of the whiting 

 young in the waters within the Skaw. The ever chauging conditions under Avhich 

 the young grow up whilst they are being carried by the current cause the growth 

 to be very various for the different individuals. The measurements group them- 



* On the 29th of June, the day after we had taken whiting young in the soiitherly 

 Great Belt, we went to the soiith and eawt through the western part of the western Baltic and 

 were constantly meeting many Ci/anea cap. in the surface layers. We found no whiting young 

 here but on the other hånd the cod }-oung, which appeared in similar rnanner to the whiting 

 young hl the Great Belt. 



D. 29—6—04. Nysted ehurch in N. E., 10 miles, 6—9 fm (Tab. 1, western Baltic.) 

 Young-flsh trawl — 4 fm., 20 minutes: 5 cod young, one of which was S'/j ctm. with chequered 

 pigmentation, the others smaller, some other lish young, speeimens of Cyanea cap. 



We mav consider these cod young, either as stragglers, which had not yet passed over 

 to the bottom-stage as late as June 29th, or as regards those with the chequered pigmentation as 

 having taken up a free-swimming mode of life under the jelly-fishes instead of seeking the bottom. 



** If a species living in Danish water.'* has hoih a jielagic and a bottom-,stage, its pelagic 

 stage comes under the influence of the surface current, the bottom-stages under that of the bottom- 

 current. If these currents have the same direction, they intensity each others influence. Tims 

 in the autumn of 1904 we met the whiting young in the true Baltic, because the pelagic young 

 had been carried far down into our waters by the incoming surface-current at the end of June, 

 and when tlie young later approached the bottom they were again surrounded by water which 

 was flowing inwards in the direction of the true Baltic. 



The cod young in 1904 were carried northward in the pelagic stage through our waters, 

 borne by the surface-current, but in changing over to the bottom-stage it is quite possible that 

 they also came into the water-masses, which were flowing into the Danish waters along the 

 bottom. In tliis way some of the cod young, wliich are carried by the current away from the 

 intermediate areas of our waters, may perhaps gradually return to these. 



